Lots of Very Short Gusts
There was a fairly strong breeze, but it was coming right over Bald Eagle Ridge to the south of the lake, a somewhat unusual direction. As a consequence, there were many gusts strong enough for me to get my front foot in the strap but which didn't last long enough for me to also get my back foot in. The video below doesn't really show that; it just gives an intimate view of the board on the water during a sub-planing tack. (The GoPro got aimed low in one of the many times I crashed in the water as a consequence of sudden loss of wind.)
This is Bill vdB, sharing little vignettes of windsurfing on Sayers Lake, in Howard PA. and sometimes elsewhere.